Nikon D3400 Two Lens Kit オーナーマニュアル

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Technical Notes
A
Calculating Angle of View
The size of the area exposed by a 35mm camera is 36 × 24 mm. The 
size of the area exposed by the D3400, in contrast, is 23.5 × 15.6 mm, 
meaning that the angle of view of a 35mm camera is approximately 
1.5 times that of the D3400. The approximate focal length of lenses for 
the D3400 in 35mm format can be calculated by multiplying the focal 
length of the lens by about 1.5.
Picture size (35mm format)
Lens
(36 × 24 mm)
Picture diagonal
Picture size (D3400)
(23.5 × 15.6 mm)
Angle of view (35mm format)
Angle of view (D3400)